package com.panshi.tools;


import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class IPUtils {


	/**
	 * 获取请求中的真实IP
	 * @param request
	 * @return
	 */
	public final static String getIpAddr(HttpServletRequest request) {
		String ipAddress = request.getHeader("x-forwarded-for");
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getRemoteAddr();
			if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
				// 根据网卡取本机配置的IP
				InetAddress inet = null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {

					System.out.println(e.getMessage());

				}
				ipAddress = inet.getHostAddress();
			}
		}
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
															// = 15
			if (ipAddress.indexOf(",") > 0) {
				ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
			}
		}
		return ipAddress;
	}

	/**
	 * 把IP转换成Long类型数据
	 * @param ip
	 * @return
	 */
	public static Long getIpToLong(String ip) {
		String[] ipStr = ip.split("\\.");
		return 256 * 256 * 256 * Long.parseLong(ipStr[0])
				+ 256 * 256 * Long.parseLong(ipStr[1])
				+ 256 * Long.parseLong(ipStr[2])
				+ Long.parseLong(ipStr[3]);
	}


	/**
	 * 将Long类型的IP转化成普通
	 * @param ipaddress
	 * @return
	 */
	public static String getIpToString(Long ipaddress){
		StringBuffer sb = new StringBuffer("");
		sb.append(String.valueOf((ipaddress >>> 24)));
		sb.append(".");
		sb.append(String.valueOf((ipaddress & 0x00FFFFFF) >>> 16));
		sb.append(".");
		sb.append(String.valueOf((ipaddress & 0x0000FFFF) >>> 8));
		sb.append(".");
		sb.append(String.valueOf((ipaddress & 0x000000FF)));
		return sb.toString();
	}

}
